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220-1201 Practice Question: That their computer randomly freezes and displays…
A user reports that their computer randomly freezes and displays a blue screen error with the message 'MEMORY_MANAGEMENT'. They recently installed a new 8 GB DDR4 module alongside the existing 8 GB module. Both modules are from different manufacturers and have different CAS latencies. What is the most likely cause of the issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The RAM modules have mismatched CAS latencies, causing timing conflicts.
Mixing RAM modules with different specifications, especially CAS latency, can cause timing mismatches that lead to system instability and blue screen errors like MEMORY_MANAGEMENT. The system tries to run both sticks at the same timings, which can fail if the modules are not compatible.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The new RAM module is defective.
Why it's wrong here
While a truly defective RAM module can cause system instability and random freezes, it is less probable than incompatibility when a new module is introduced alongside existing RAM. A hardware defect typically results in more immediate or consistent failures, such as a complete inability to boot or persistent blue screens. In this scenario, the random nature of the freezes points more towards a subtle timing conflict rather than a physical fault in the module itself.
- ✗
The RAM is not seated properly in the slot.
Why it's wrong here
Improperly seated RAM modules most commonly prevent the system from booting entirely, often resulting in a "no-boot" scenario or specific POST (Power-On Self-Test) beep codes indicating a memory issue. While it's always a good practice to verify seating, random freezes *after* the system has successfully booted and been running for some time are less characteristic of a physical seating problem and more indicative of a logical or timing conflict.
- ✓
The RAM modules have mismatched CAS latencies, causing timing conflicts.
Why this is correct
This is the most probable cause. When RAM modules with different CAS (Column Access Strobe) latencies are installed together, the memory controller attempts to operate all modules at the slowest common timing to maintain stability. However, if the modules are not designed to function reliably at these forced, potentially suboptimal, combined timings, it can lead to intermittent data corruption and system instability, manifesting as random freezes or blue screens. This subtle incompatibility often surfaces under varying system loads.
- ✗
The motherboard does not support 16 GB of RAM.
Why it's wrong here
Most modern motherboards, even those a few years old, readily support 16 GB of RAM, often across two or four slots. If the motherboard's maximum capacity were exceeded, the system would typically fail to boot or only recognize a portion of the installed memory, rather than experiencing random freezes after booting. The issue here is not the total amount of RAM, but rather the specific electrical and timing characteristics of the *individual* modules when paired together.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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